Experimental And Application Research On Household Split Ground Source Heat Pump System In Handan Area

At this stage,my country’s economy is showing a trend of rapid growth,followed by the gradual shortage of energy,the continued deterioration of the ecology,and the gradual intensification of the greenhouse effect.For a long time,the rural areas in northern my country have been directly burning coal for heating,which directly caused the haze problem to become more serious.Based on this,the Chinese government has formulated relevant policies for clean heating in northern my country,and clean heating methods applied to rural areas have become the focus of attention.This article first introduces a new type of household split ground source heat pump system and its operating principle,analyzes its advantages as a new form of clean heating in rural areas,and discusses its advantages compared with traditional ground source heat pump systems.Differences and connections.Then through the experimental platform of the split ground source heat pump system built in the ground source heat pump laboratory of Hebei University of Technology in Handan,the operating performance of the split ground source heat pump system and the amount of each linear meter under different buried pipe diameters and forms were tested and analyzed.Heat,get double U-shaped DN32 underground pipe>double U-shaped DN25 underground pipe>single U-shaped DN32 underground pipe>single U-shaped DN25 underground pipe.On this basis,according to the actual use habits of farmers,the operating characteristics of the split ground source heat pump system are analyzed.The intermittent operation of the two indoor units is conducive to the recovery of soil temperature and the improvement of the coefficient of performance of the unit.The overall operating performance and energy saving of the system Better,it provides a reference for subsequent practical applications in rural areas.Taking a farmer’s house in Handan area as the research object,building a research model through TRNSYS software,and then calculating the hourly load of the building in a year.According to the data and conclusions obtained from previous experiments,it is a split ground source heat pump applied to the house.The system carries out the design calculation of the buried pipe heat exchanger and the selection of the unit equipment.It is calculated that a double U-shaped DN32 buried pipe heat exchanger with a well depth of 120 m can meet the requirements.The selected heat pump unit is a one-drive two-split ground The source heat pump unit has a heating capacity of 5.2k W and a cooling capacity of 5.4k W.The circulating water pump is a fixed frequency and constant flow water pump provided by the unit manufacturer.After the system is put into use,use TRNSYS software to establish a simulation model of the household’s heat pump system,and compare it with the actual monitoring value to verify the accuracy of the model.Finally,we customized a system operation plan for continuous operation of a unit and intermittent operation of a unit,and analyzed the simulated operation of the split ground source heat pump system for one year.It was found that the split heat pump units produced in the market were built-in The operation of the fixedfrequency water pump has caused energy waste and low energy efficiency of the system;the problem of unbalanced soil cold and heat still exists under the condition of intermittent operation.In this regard,a system optimization plan was proposed:on the premise of meeting the living habits and thermal comfort of rural residents,a circulating water pump controlled by a variable frequency constant temperature difference was selected and the indoor temperature adjustment in winter was set to18°C.The system before and after optimization was compared,and a ten-year dynamic simulation was carried out.The system’s power consumption,the system’s annual performance coefficient and the average soil temperature were used as evaluation indicators to compare and analyze the long-term operating conditions of the system.The results showed that: Before optimization,the system consumes 30%of energy and saves energy;the annual coefficient of performance of the system is increased by 21.2%;the average soil temperature decreases at a slower rate,which helps to alleviate the imbalance of soil cold and heat.The optimized split ground source heat pump system has better operating performance and significant energysaving effect than before optimization,so as to provide reference and reference for the future research and application of split ground source heat pump system.